As we shared on Reddit, we're happy to announce the immediate availability of IMAP (and OAuth) for Outlook.com. Outlook.com already supports the industry's best email connectivity with Exchange ActiveSync (EAS), which is available on the majority of smartphones and tablets, including Windows Phone, iOS, and Android devices, as well as the Windows 8 Mail app and Outlook 2013. With today's announcement, we now have a richer email experience across devices and apps, including those not using EAS, such as Mac Mail and Thunderbird on a Mac.
In addition to offering more complete device connectivity, IMAP (along with OAuth) gives developers opportunities to build third-party clients and services that offer value-added scenarios on top of your Outlook.com email. We are excited to launch the first set of services today that integrate with Outlook.com, and look forward to sharing many more in the future.